1 /*- 2 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> 3 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> 4 * Internet Initiative Japan, Inc (IIJ) 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #include <sys/param.h> 32 #include <netinet/in.h> 33 #include <netinet/in_systm.h> 34 #include <netinet/ip.h> 35 #include <sys/socket.h> 36 #include <sys/un.h> 37 38 #include <pwd.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <termios.h> 43 #include <unistd.h> 44 45 #ifndef NOPAM 46 #include <security/pam_appl.h> 47 #ifdef OPENPAM 48 #include <security/openpam.h> 49 #endif 50 #endif /* !NOPAM */ 51 52 #include "layer.h" 53 #include "mbuf.h" 54 #include "defs.h" 55 #include "log.h" 56 #include "timer.h" 57 #include "fsm.h" 58 #include "iplist.h" 59 #include "throughput.h" 60 #include "slcompress.h" 61 #include "lqr.h" 62 #include "hdlc.h" 63 #include "ncpaddr.h" 64 #include "ipcp.h" 65 #include "auth.h" 66 #include "systems.h" 67 #include "lcp.h" 68 #include "ccp.h" 69 #include "link.h" 70 #include "descriptor.h" 71 #include "chat.h" 72 #include "proto.h" 73 #include "filter.h" 74 #include "mp.h" 75 #ifndef NORADIUS 76 #include "radius.h" 77 #endif 78 #include "cbcp.h" 79 #include "chap.h" 80 #include "async.h" 81 #include "physical.h" 82 #include "datalink.h" 83 #include "ipv6cp.h" 84 #include "ncp.h" 85 #include "bundle.h" 86 87 const char * 88 Auth2Nam(u_short auth, u_char type) 89 { 90 static char chap[10]; 91 92 switch (auth) { 93 case PROTO_PAP: 94 return "PAP"; 95 case PROTO_CHAP: 96 snprintf(chap, sizeof chap, "CHAP 0x%02x", type); 97 return chap; 98 case 0: 99 return "none"; 100 } 101 return "unknown"; 102 } 103 104 #if !defined(NOPAM) && !defined(OPENPAM) 105 static int 106 pam_conv(int n, const struct pam_message **msg, struct pam_response **resp, 107 void *data) 108 { 109 110 if (n != 1 || msg[0]->msg_style != PAM_PROMPT_ECHO_OFF) 111 return (PAM_CONV_ERR); 112 if ((*resp = malloc(sizeof(struct pam_response))) == NULL) 113 return (PAM_CONV_ERR); 114 (*resp)[0].resp = strdup((const char *)data); 115 (*resp)[0].resp_retcode = 0; 116 117 return ((*resp)[0].resp != NULL ? PAM_SUCCESS : PAM_CONV_ERR); 118 } 119 #endif /* !defined(NOPAM) && !defined(OPENPAM) */ 120 121 static int 122 auth_CheckPasswd(const char *name, const char *data, const char *key) 123 { 124 if (!strcmp(data, "*")) { 125 #ifdef NOPAM 126 /* Then look up the real password database */ 127 struct passwd *pw; 128 int result; 129 130 result = (pw = getpwnam(name)) && 131 !strcmp(crypt(key, pw->pw_passwd), pw->pw_passwd); 132 endpwent(); 133 return result; 134 #else /* !NOPAM */ 135 /* Then consult with PAM. */ 136 pam_handle_t *pamh; 137 int status; 138 139 struct pam_conv pamc = { 140 #ifdef OPENPAM 141 &openpam_nullconv, NULL 142 #else 143 &pam_conv, key 144 #endif 145 }; 146 147 if (pam_start("ppp", name, &pamc, &pamh) != PAM_SUCCESS) 148 return (0); 149 #ifdef OPENPAM 150 if ((status = pam_set_item(pamh, PAM_AUTHTOK, key)) == PAM_SUCCESS) 151 #endif 152 status = pam_authenticate(pamh, 0); 153 pam_end(pamh, status); 154 return (status == PAM_SUCCESS); 155 #endif /* !NOPAM */ 156 } 157 158 return !strcmp(data, key); 159 } 160 161 int 162 auth_SetPhoneList(const char *name, char *phone, int phonelen) 163 { 164 FILE *fp; 165 int n, lineno; 166 char *vector[6], buff[LINE_LEN]; 167 const char *slash; 168 169 fp = OpenSecret(SECRETFILE); 170 if (fp != NULL) { 171 again: 172 lineno = 0; 173 while (fgets(buff, sizeof buff, fp)) { 174 lineno++; 175 if (buff[0] == '#') 176 continue; 177 buff[strlen(buff) - 1] = '\0'; 178 memset(vector, '\0', sizeof vector); 179 if ((n = MakeArgs(buff, vector, VECSIZE(vector), PARSE_REDUCE)) < 0) 180 log_Printf(LogWARN, "%s: %d: Invalid line\n", SECRETFILE, lineno); 181 if (n < 5) 182 continue; 183 if (strcmp(vector[0], name) == 0) { 184 CloseSecret(fp); 185 if (*vector[4] == '\0') 186 return 0; 187 strncpy(phone, vector[4], phonelen - 1); 188 phone[phonelen - 1] = '\0'; 189 return 1; /* Valid */ 190 } 191 } 192 193 if ((slash = strrchr(name, '\\')) != NULL && slash[1]) { 194 /* Look for the name without the leading domain */ 195 name = slash + 1; 196 rewind(fp); 197 goto again; 198 } 199 200 CloseSecret(fp); 201 } 202 *phone = '\0'; 203 return 0; 204 } 205 206 int 207 auth_Select(struct bundle *bundle, const char *name) 208 { 209 FILE *fp; 210 int n, lineno; 211 char *vector[5], buff[LINE_LEN]; 212 const char *slash; 213 214 if (*name == '\0') { 215 ipcp_Setup(&bundle->ncp.ipcp, INADDR_NONE); 216 return 1; 217 } 218 219 #ifndef NORADIUS 220 if (bundle->radius.valid && bundle->radius.ip.s_addr != INADDR_NONE && 221 bundle->radius.ip.s_addr != RADIUS_INADDR_POOL) { 222 /* We've got a radius IP - it overrides everything */ 223 if (!ipcp_UseHisIPaddr(bundle, bundle->radius.ip)) 224 return 0; 225 ipcp_Setup(&bundle->ncp.ipcp, bundle->radius.mask.s_addr); 226 /* Continue with ppp.secret in case we've got a new label */ 227 } 228 #endif 229 230 fp = OpenSecret(SECRETFILE); 231 if (fp != NULL) { 232 again: 233 lineno = 0; 234 while (fgets(buff, sizeof buff, fp)) { 235 lineno++; 236 if (buff[0] == '#') 237 continue; 238 buff[strlen(buff) - 1] = '\0'; 239 memset(vector, '\0', sizeof vector); 240 if ((n = MakeArgs(buff, vector, VECSIZE(vector), PARSE_REDUCE)) < 0) 241 log_Printf(LogWARN, "%s: %d: Invalid line\n", SECRETFILE, lineno); 242 if (n < 2) 243 continue; 244 if (strcmp(vector[0], name) == 0) { 245 CloseSecret(fp); 246 #ifndef NORADIUS 247 if (!bundle->radius.valid || bundle->radius.ip.s_addr == INADDR_NONE) { 248 #endif 249 if (n > 2 && *vector[2] && strcmp(vector[2], "*") && 250 !ipcp_UseHisaddr(bundle, vector[2], 1)) 251 return 0; 252 ipcp_Setup(&bundle->ncp.ipcp, INADDR_NONE); 253 #ifndef NORADIUS 254 } 255 #endif 256 if (n > 3 && *vector[3] && strcmp(vector[3], "*")) 257 bundle_SetLabel(bundle, vector[3]); 258 return 1; /* Valid */ 259 } 260 } 261 262 if ((slash = strrchr(name, '\\')) != NULL && slash[1]) { 263 /* Look for the name without the leading domain */ 264 name = slash + 1; 265 rewind(fp); 266 goto again; 267 } 268 269 CloseSecret(fp); 270 } 271 272 #ifndef NOPASSWDAUTH 273 /* Let 'em in anyway - they must have been in the passwd file */ 274 ipcp_Setup(&bundle->ncp.ipcp, INADDR_NONE); 275 return 1; 276 #else 277 #ifndef NORADIUS 278 if (bundle->radius.valid) 279 return 1; 280 #endif 281 282 /* Disappeared from ppp.secret ??? */ 283 return 0; 284 #endif 285 } 286 287 int 288 auth_Validate(struct bundle *bundle, const char *name, const char *key) 289 { 290 /* Used by PAP routines */ 291 292 FILE *fp; 293 int n, lineno; 294 char *vector[5], buff[LINE_LEN]; 295 const char *slash; 296 297 fp = OpenSecret(SECRETFILE); 298 again: 299 lineno = 0; 300 if (fp != NULL) { 301 while (fgets(buff, sizeof buff, fp)) { 302 lineno++; 303 if (buff[0] == '#') 304 continue; 305 buff[strlen(buff) - 1] = 0; 306 memset(vector, '\0', sizeof vector); 307 if ((n = MakeArgs(buff, vector, VECSIZE(vector), PARSE_REDUCE)) < 0) 308 log_Printf(LogWARN, "%s: %d: Invalid line\n", SECRETFILE, lineno); 309 if (n < 2) 310 continue; 311 if (strcmp(vector[0], name) == 0) { 312 CloseSecret(fp); 313 return auth_CheckPasswd(name, vector[1], key); 314 } 315 } 316 } 317 318 if ((slash = strrchr(name, '\\')) != NULL && slash[1]) { 319 /* Look for the name without the leading domain */ 320 name = slash + 1; 321 if (fp != NULL) { 322 rewind(fp); 323 goto again; 324 } 325 } 326 327 if (fp != NULL) 328 CloseSecret(fp); 329 330 #ifndef NOPASSWDAUTH 331 if (Enabled(bundle, OPT_PASSWDAUTH)) 332 return auth_CheckPasswd(name, "*", key); 333 #endif 334 335 return 0; /* Invalid */ 336 } 337 338 char * 339 auth_GetSecret(const char *name, size_t len) 340 { 341 /* Used by CHAP routines */ 342 343 FILE *fp; 344 int n, lineno; 345 char *vector[5]; 346 const char *slash; 347 static char buff[LINE_LEN]; /* vector[] will point here when returned */ 348 349 fp = OpenSecret(SECRETFILE); 350 if (fp == NULL) 351 return (NULL); 352 353 again: 354 lineno = 0; 355 while (fgets(buff, sizeof buff, fp)) { 356 lineno++; 357 if (buff[0] == '#') 358 continue; 359 n = strlen(buff) - 1; 360 if (buff[n] == '\n') 361 buff[n] = '\0'; /* Trim the '\n' */ 362 memset(vector, '\0', sizeof vector); 363 if ((n = MakeArgs(buff, vector, VECSIZE(vector), PARSE_REDUCE)) < 0) 364 log_Printf(LogWARN, "%s: %d: Invalid line\n", SECRETFILE, lineno); 365 if (n < 2) 366 continue; 367 if (strlen(vector[0]) == len && strncmp(vector[0], name, len) == 0) { 368 CloseSecret(fp); 369 return vector[1]; 370 } 371 } 372 373 if ((slash = strrchr(name, '\\')) != NULL && slash[1]) { 374 /* Go back and look for the name without the leading domain */ 375 len -= slash - name + 1; 376 name = slash + 1; 377 rewind(fp); 378 goto again; 379 } 380 381 CloseSecret(fp); 382 return (NULL); /* Invalid */ 383 } 384 385 static void 386 AuthTimeout(void *vauthp) 387 { 388 struct authinfo *authp = (struct authinfo *)vauthp; 389 390 timer_Stop(&authp->authtimer); 391 if (--authp->retry > 0) { 392 authp->id++; 393 (*authp->fn.req)(authp); 394 timer_Start(&authp->authtimer); 395 } else { 396 log_Printf(LogPHASE, "Auth: No response from server\n"); 397 datalink_AuthNotOk(authp->physical->dl); 398 } 399 } 400 401 void 402 auth_Init(struct authinfo *authp, struct physical *p, auth_func req, 403 auth_func success, auth_func failure) 404 { 405 memset(authp, '\0', sizeof(struct authinfo)); 406 authp->cfg.fsm.timeout = DEF_FSMRETRY; 407 authp->cfg.fsm.maxreq = DEF_FSMAUTHTRIES; 408 authp->cfg.fsm.maxtrm = 0; /* not used */ 409 authp->fn.req = req; 410 authp->fn.success = success; 411 authp->fn.failure = failure; 412 authp->physical = p; 413 } 414 415 void 416 auth_StartReq(struct authinfo *authp) 417 { 418 timer_Stop(&authp->authtimer); 419 authp->authtimer.func = AuthTimeout; 420 authp->authtimer.name = "auth"; 421 authp->authtimer.load = authp->cfg.fsm.timeout * SECTICKS; 422 authp->authtimer.arg = (void *)authp; 423 authp->retry = authp->cfg.fsm.maxreq; 424 authp->id = 1; 425 (*authp->fn.req)(authp); 426 timer_Start(&authp->authtimer); 427 } 428 429 void 430 auth_StopTimer(struct authinfo *authp) 431 { 432 timer_Stop(&authp->authtimer); 433 } 434 435 struct mbuf * 436 auth_ReadHeader(struct authinfo *authp, struct mbuf *bp) 437 { 438 size_t len; 439 440 len = m_length(bp); 441 if (len >= sizeof authp->in.hdr) { 442 bp = mbuf_Read(bp, (u_char *)&authp->in.hdr, sizeof authp->in.hdr); 443 if (len >= ntohs(authp->in.hdr.length)) 444 return bp; 445 authp->in.hdr.length = htons(0); 446 log_Printf(LogWARN, "auth_ReadHeader: Short packet (%u > %zu) !\n", 447 ntohs(authp->in.hdr.length), len); 448 } else { 449 authp->in.hdr.length = htons(0); 450 log_Printf(LogWARN, "auth_ReadHeader: Short packet header (%u > %zu) !\n", 451 (int)(sizeof authp->in.hdr), len); 452 } 453 454 m_freem(bp); 455 return NULL; 456 } 457 458 struct mbuf * 459 auth_ReadName(struct authinfo *authp, struct mbuf *bp, size_t len) 460 { 461 if (len > sizeof authp->in.name - 1) 462 log_Printf(LogWARN, "auth_ReadName: Name too long (%zu) !\n", len); 463 else { 464 size_t mlen = m_length(bp); 465 466 if (len > mlen) 467 log_Printf(LogWARN, "auth_ReadName: Short packet (%zu > %zu) !\n", 468 len, mlen); 469 else { 470 bp = mbuf_Read(bp, (u_char *)authp->in.name, len); 471 authp->in.name[len] = '\0'; 472 return bp; 473 } 474 } 475 476 *authp->in.name = '\0'; 477 m_freem(bp); 478 return NULL; 479 } 480